In this mini-series, I plan to walk you through Docker as I learn it.
A complete list of post in this series is included below :
- Day 1 - Exploring Docker for Windows - Getting Started
- Day 2 - Exploring Docker for Windows - Stopping and Restarting Containers
- Day 3 - Exploring Docker for Windows - Removing Containers and Images
- Day 4 - Exploring Docker for Windows - Running Docker Documentation Locally
- Day 5 - Exploring Docker for Windows - Running A Command Prompt Inside a Container
- Day 6 - Exploring Docker for Windows - Accessing Files inside a Container
Accessing Files inside a Container
One thing that I’m finding that I need more and more is access to the files inside of a container. There are a lot of great guides on mapping a drive using Windows Explorer and I’d encourage you read this one if you are looking for that. If you are like me and using Windows 10 to host and work with Docker, than you might want to use the command-line instead of Windows explorer. Open up PowerShell and type the following :
docker run -it microsoft/dotnet:nanoserver powershell
We are now running PowerShell in a container inside of a PowerShell on our local machine. You can quickly determine which version of PowerShell you are using by listing out a directory as shown below.
Windows PowerShell Copyright (C) 2016 Microsoft Corporation. All rights reserved. PS C:\> dir Directory: C:\ Mode LastWriteTime Length Name ---- ------------- ------ ---- d----- 4/9/2017 8:14 PM Program Files d----- 7/16/2016 5:09 AM Program Files (x86) d-r--- 3/20/2017 7:34 AM Users d----- 3/20/2017 7:35 AM Windows -a---- 11/20/2016 3:32 AM 1894 License.txt
Notice that it has a
License.txt file. You can use the
type command to list out its contents and will see it is a host container image licensed by Microsoft. You can navigate to any directory, list out the contents, add or delete a file.
Note : If you are using Windows Server, then you can open Computer Management and see the drive after running the
docker run -it microsoft/dotnet:nanoserver powershell command. You can simply assign the drive a letter and examine it in File Explorer. Just FYI - I wouldn’t do this in a production environment.
Environment variables inside a Container
While you are already in PowerShell, you can also grab environment variables by running the following command :
Which outputs the following :
Name Value ---- ----- ALLUSERSPROFILE C:\ProgramData APPDATA C:\Users\ContainerAdministrator\AppData\Roaming CommonProgramFiles C:\Program Files\Common Files CommonProgramFiles(x86) C:\Program Files (x86)\Common Files CommonProgramW6432 C:\Program Files\Common Files COMPUTERNAME A6F1D1FF8D31 ComSpec C:\Windows\system32\cmd.exe DOTNET_SDK_DOWNLOAD_URL https://dotnetcli.blob.core.windows.net/dotnet/Sdk/1.0.1/dotnet-dev-win-x188.8.131.52.zip DOTNET_SDK_VERSION 1.0.1 LOCALAPPDATA C:\Users\ContainerAdministrator\AppData\Local NUGET_XMLDOC_MODE skip NUMBER_OF_PROCESSORS 2 OS Windows_NT Path C:\Windows\system32;C:\Windows;C:\Windows\System32\Wbem;C:\Windows\System32\WindowsPo... PATHEXT .COM;.EXE;.BAT;.CMD PROCESSOR_ARCHITECTURE AMD64 PROCESSOR_IDENTIFIER Intel64 Family 6 Model 61 Stepping 4, GenuineIntel PROCESSOR_LEVEL 6 PROCESSOR_REVISION 3d04 ProgramData C:\ProgramData ProgramFiles C:\Program Files ProgramFiles(x86) C:\Program Files (x86) ProgramW6432 C:\Program Files PSMODULEPATH C:\Users\ContainerAdministrator\Documents\WindowsPowerShell\Modules;C:\Program Files\... PUBLIC C:\Users\Public SystemDrive C: SystemRoot C:\Windows TEMP C:\Users\ContainerAdministrator\AppData\Local\Temp TMP C:\Users\ContainerAdministrator\AppData\Local\Temp USERDOMAIN User Manager USERNAME ContainerAdministrator USERPROFILE C:\Users\ContainerAdministrator windir C:\Windows
This again is an easy way to determine if you are in a container or not and contains other special environment variables such as .NET Core which we looked at in the last post.
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